<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .one{
            width: 50%;
            height: 400px;
            background-color: pink;
            display: flex;
            /*flex-direction: column;*/
            /*flex-direction: row;*/
            /*flex-direction: row-reverse;*/
            /*flex-direction: column;*/
            /*flex-direction: column-reverse;*/
            /*justify-content: flex-start;*/
            /*justify-content: flex-end;*/
            /*justify-content: center;*/
            /*justify-content: space-around;*/
            /*justify-content: space-between;*/
            /*justify-content: flex-start;*/
            /*justify-content: flex-end;*/
            /*justify-content: center;*/
            /*justify-content: space-around;*/
            /*justify-content: space-between;*/
            /*flex-wrap: wrap;*/
            /*align-items: flex-start;*/
            /*align-items: center;*/
            /*align-items: flex-end;*/
            /*align-items: stretch;*/
            /*align-content: flex-start;*/
            /*align-content: center;*/
            /*align-content: flex-end;*/
            /*align-content: space-around;*/
            /*align-content: space-between;*/
            /*align-content: stretch;*/
            flex-flow: column-reverse wrap;
        }
        .one span{
            width: 200px;
            height: 100px;
            background-color: skyblue;
            /*margin-bottom: 5px;*/
            /*margin-right: 5px;*/
        }
        .two{
            display: flex;
            width: 60%;
            margin: 10px auto;
            height: 100px;
            background-color: skyblue;
        }
        .two div:nth-child(1){
            width: 100px;
            height: 100px;
            background-color: greenyellow;
        }
        .two div:nth-child(3){
            width: 100px;
            height: 100px;
            background-color: mediumpurple;
        }
        .two div:nth-child(2){
            flex: 1;
        }
        .three{
            width: 50%;
            height: 100px;
            background-color: darkorange;
            margin: 10px auto;
            display: flex;
        }
        .three span{
            flex: 1;
        }
        .three span:nth-child(2){
            flex: 2;
            background-color: yellow;
        }
        .four{
            width: 500px;
            height: 400px;
            background-color: lemonchiffon;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            align-items: center;
        }
        .four span{
            width: 100px;
            height: 100px;
            /*margin-top: 5px;*/
            background-color: #4b90ed;
        }
        .four span:nth-child(2){
            align-self: flex-end;
            order: -1;
        }
        .four span:first-child{
            order: 1;
        }
    </style>
</head>
<body>
<div class="one">
    <span>1</span>
    <span>2</span>
    <span>3</span>
    <span>4</span>
    <span>5</span>
    <span>6</span>
    <span>7</span>
    <span>8</span>
    <span>9</span>
    <span>10</span>
</div>
<div class="two">
    <div></div>
    <div></div>
    <div></div>
</div>
<div class="three">
    <span>1</span>
    <span>2</span>
    <span>3</span>
</div>
<div class="four">
    <span>1</span>
    <span>2</span>
    <span>3</span>
</div>
</body>
</html>
